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EP2767295B1 - Implant biocorrodable doté d'un revêtement anticorrosion - Google Patents

Implant biocorrodable doté d'un revêtement anticorrosion Download PDF

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Publication number
EP2767295B1
EP2767295B1 EP13193269.1A EP13193269A EP2767295B1 EP 2767295 B1 EP2767295 B1 EP 2767295B1 EP 13193269 A EP13193269 A EP 13193269A EP 2767295 B1 EP2767295 B1 EP 2767295B1
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EP
European Patent Office
Prior art keywords
implant
magnesium
corrosion
stent
biocorrodible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP13193269.1A
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German (de)
English (en)
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EP2767295A1 (fr
Inventor
Eric Wittchow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Biotronik AG
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Biotronik AG
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L31/148—Materials at least partially resorbable by the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/02—Inorganic materials
    • A61L31/022—Metals or alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/08—Materials for coatings
    • A61L31/10—Macromolecular materials

Definitions

  • the invention relates to a biocorrodible implant in the form of a stent based on magnesium or a biocorrodible magnesium alloy whose surface has a corrosion-inhibiting coating.
  • stents have the purpose to take on a supportive function in hollow organs of a patient.
  • stents of conventional design have a filigree support structure made of metallic struts, which is initially present in a compressed form for introduction into the body and is widened at the site of the application.
  • a filigree support structure made of metallic struts, which is initially present in a compressed form for introduction into the body and is widened at the site of the application.
  • vasoconstrictions in particular of constrictions (stenoses) of the coronary arteries.
  • aneurysm stents are known, which serve primarily to seal the aneurysm.
  • Stents have a peripheral wall of sufficient bearing capacity to keep the stenosed vessel open to the desired extent, and a tubular body through which blood flow continues unimpeded.
  • the peripheral wall is usually formed by a grid-like support structure, which allows to introduce the stent in a compressed state with a small outer diameter to be treated bottleneck of the respective vessel and there, for example, with the help of a balloon catheter expand so far that the vessel the desired having enlarged inner diameter.
  • shape memory materials such as nitinol have the ability to self-expand when a restoring force that keeps the implant to a small diameter is eliminated.
  • the restoring force is usually exerted by a protective tube on the material.
  • the stent has a base body made of an implant material.
  • An implant material is a non-living material that is used in medical applications and interacts with biological systems.
  • Biocompatibility is the ability of a material to produce an appropriate tissue reaction in a specific application. This involves an adaptation of the chemical, physical, biological and morphological surface properties of an implant to the recipient tissue with the aim of a clinically desired interaction.
  • the biocompatibility of the implant material is also dependent on the timing of the reaction of the biosystem is implanted in the. Thus, irritations and inflammations occur relatively quickly, which can lead to tissue changes.
  • Implant materials include polymers, metallic materials, and ceramic materials (for example, as a coating).
  • Biocompatible metals and metal alloys for permanent implants include, for example, stainless steels (eg, 316L), cobalt base alloys (eg, CoCrMo cast alloys, CoCrMo forged alloys, CoCrWNi forged alloys, and CoCrNiMo forged alloys), pure titanium, and titanium alloys (for example, cp titanium, TiAl6V4, or TiAl6Nb7). and gold alloys.
  • the use of magnesium or pure iron and biocorrodible base alloys of the elements magnesium, iron, zinc, molybdenum and tungsten is proposed.
  • metallic implant materials of interest which consist wholly or in part of magnesium or biocorrodible magnesium alloys.
  • a starting point for improving the corrosion behavior is to produce a corrosion-protective layer on the molding made of magnesium or a magnesium alloy.
  • Known methods for producing a corrosion-protective layer have hitherto been developed and optimized from the point of view of a technical use of the shaped body-but not medical-technical use in biocorrodible implants in a physiological environment. These known methods include: the application of polymers or inorganic cover layers, the production of an enamel, the chemical conversion of the surface, hot gas oxidation, anodization, Plasma spraying, laser remelting, PVD, ion implantation or painting.
  • the mechanisms underlying the corrosion may deviate from the usual technical applications of the material.
  • stents, surgical material or clips are mechanically deformed during use, so that the sub-process of stress corrosion cracking is likely to have significant significance in the degradation of these moldings.
  • the main body of stents is subject to locally varying degrees of plastic deformation in use.
  • Conventional methods for inhibiting corrosion such as the generation of a dense magnesium oxide topcoat, are not effective here.
  • the ceramic properties of such a cover layer would lead to local flaking of the cover layer. The corrosion would thus take place in an uncontrolled manner and there would be a particular danger that in the mechanically stressed areas of the implant corrosion is forced.
  • the stent has a base made of magnesium or a biocorrodible magnesium alloy, and a corrosion-inhibiting passivation layer covering the base body.
  • the 3-polyhydroxyalkanoate is selected from the group comprising polyhydroxyhexanoate (PHHx), polyhydroxyheptanoate (PHHp), polyhydroxyoctonoate (PHO) and polyhydroxynonanoate (PHN).
  • PHA Polyhydroxyalkanoates
  • the polymers are biodegradable and are used to make plastics, but also as a biodegradable material for medical devices such as sutures, implants and pharmaceutical depot preparations.
  • the biosynthesis of PHA provides, depending on the microorganism and cultivation conditions used, various homo- or copolyesters which differ in their properties.
  • the polymers are usually UV-stable, tolerate processing temperatures of up to 180 ° C and show a low permeation of water.
  • the simplest and most abundant form of PHA is the fermentatively produced poly (R-3-hydroxybutyrate) (polyhydroxybutyrate, PHB or poly (3HB).)
  • PHB and other short-chain PHAs are, however, relatively brittle and rigid.
  • the invention is based on the finding that the use of long-chain polyhydroxyalkanoates with C6-C9-derived polyhydroxy fatty acids as coating materials for implants, (in particular for stents), of magnesium or magnesium alloys brings particular advantages.
  • the water impermeability of the passivation layer is very low, which leads to a temporary inhibition of the corrosion of the underlying metallic base body.
  • the material shows a particularly advantageous behavior for the purposes, in particular, the elongation at break of the polymeric material is sufficiently high. In the expansion of stents, therefore, there is, for example, no microcracking in the passivation layer, which could lead to an inhomogeneous degradation behavior of the implant.
  • the passivation layer may contain other adjuvants, and preferably also active ingredients, which are released after implantation.
  • the stent is cleaned of dust and residues and clamped in a suitable stent coating apparatus (DES Coater, proprietary development Fa Biotronik).
  • a suitable stent coating apparatus for the coating, a solution of 0.1% by weight of PHHx and 0.05% by weight of a pharmacologically active substance (for example rapamycin) in chloroform is prepared.
  • the rotating stent is coated on one side under constant ambient conditions (room temperature, 42% humidity).
  • room temperature, 42% humidity At a nozzle distance of 20mm, an 18mm long stent is coated after about 10min.
  • the stent is dried for 5 minutes at room temperature before the uncoated side is coated in the same way after turning the stent and re-clamping.
  • the finished coated stent is dried for 24 h at 80 ° C in a vacuum oven.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Materials For Medical Uses (AREA)

Claims (2)

  1. Implant avec un corps de base en magnésium ou en un alliage de magnésium biocorradable et une couche de passivation empêchant la corrosion recouvrant le corps de base, où la couche de passivation contient un 3-polyhydroxy alcanoate et le 3-polyalcanoate est un homomère ou un copolymère avec un segment de polymère selon la formule (I) :
    Figure imgb0004
     avec R = un groupe propyle, butyle, pentyle ou hexyle, où l'implant est un stent.
  2. Implant selon la revendication 1, chez lequel le 3-polyhydoxy alcanoate est choisi dans le groupe comprenant un polyhydroxy hexanoate (PHHx)), un polyhydroxy heptanoate (PHHp), un polyhydroxy octonoate (PHO) et un polyhydroxy nonanoate (PHN).
EP13193269.1A 2013-02-13 2013-11-18 Implant biocorrodable doté d'un revêtement anticorrosion Active EP2767295B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US201361763955P 2013-02-13 2013-02-13

Publications (2)

Publication Number Publication Date
EP2767295A1 EP2767295A1 (fr) 2014-08-20
EP2767295B1 true EP2767295B1 (fr) 2015-11-04

Family

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Family Applications (1)

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EP13193269.1A Active EP2767295B1 (fr) 2013-02-13 2013-11-18 Implant biocorrodable doté d'un revêtement anticorrosion

Country Status (2)

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US (1) US20140228968A1 (fr)
EP (1) EP2767295B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3415651A1 (fr) * 2017-06-14 2018-12-19 Heraeus Deutschland GmbH & Co. KG Procédé de fabrication d'un produit passivé
US11697869B2 (en) 2020-01-22 2023-07-11 Heraeus Deutschland GmbH & Co. KG Method for manufacturing a biocompatible wire
US12446874B2 (en) 2021-05-10 2025-10-21 Cilag Gmbh International Cartridge assemblies with absorbable metal staples and absorbable implantable adjuncts

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060271168A1 (en) * 2002-10-30 2006-11-30 Klaus Kleine Degradable medical device
MX2009008064A (es) 2007-01-30 2009-08-07 Hemoteq Ag Soporte vascular biodegradable.
DE102007004589A1 (de) 2007-01-30 2008-07-31 Orlowski, Michael, Dr. Bioresorbierbarer Metallstent mit kontrollierter Resorption
US20090240323A1 (en) 2008-03-20 2009-09-24 Medtronic Vascular, Inc. Controlled Degradation of Magnesium Stents
EP2384725B1 (fr) * 2010-05-06 2018-07-04 Biotronik AG Implant biocorrodable, dans lequel une corrosion peut être déclenchée et accélérée une fois l'implantation effectuée par un stimulus externe

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EP2767295A1 (fr) 2014-08-20
US20140228968A1 (en) 2014-08-14

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